Diagnostic device



FIG. 1 is a perspective view of a diagnostic device, showing our new design;

FIG. 2 is a front view of thereof;

FIG. 3 is a back view of thereof;

FIG. 4 is a right side view of thereof;

FIG. 5 is a left side view of thereof;

FIG. 6 is a top view of thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines immediately adjacent the shaded areas represent the bounds of the claim, while all other broken lines are directed to environment; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a diagnostic device, as shown and described. 